Introduction

For arbitrary precision mathematics PHP offers the Binary Calculator which
supports numbers of any size and precision up to 2147483647 (or 0x7FFFFFFF) decimals,
if there is sufficient memory, represented as strings.

Caution

Passing values of type float to a BCMath function which expects
a string as operand may not have the desired effect due to the
way PHP converts float values to string, namely
that the string may be in exponential notation (what is not
supported by BCMath), and that the decimal separator is locale dependend
(while BCMath always expects a decimal point).